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Increased Reliability Through Spare Parts Optimization 640556

As part of a NASA study of a manned orbital research laboratory (Contract NAS 1-2974), a computer method was developed to select an inventory of spare parts that provide the greatest protection against mission failure for a given weight. Input data are provided by reliability predictions and failure effects analyses. Four different criteria of mission success are defined as bases for ranking value of spare parts; crew safety, laboratory survival, experimental return, and minimum degradation.